First, Trilling is recognizing the importance of history and the present to inform and motivate movement towards the future, something that Snow neglects. Snow seems focused on what the future can be in the light of science.
Also this passage seems to be saying that the value in a work of literature is not to be found entirely in the literary intellectuals or “Luddites,” but instead in the value of the work as it stands in contrast to ourselves and the qualities of life we should have. Snow is focusing on the writers themselves and the messages that they are putting forth, crudely I agree, but the relationship of the work to the reader and their beliefs is being ignored. People have the ability to understand that ideas brought to light by literary geniuses can have faults, as Trilling says: “they happen upon contempt for some idea which they have connected with political virtue, they are not slow to understand that it is not the in its ideal form that is being despised, but the idea as it passes current in specious form, among certain and particular persons.” The literary genius hits on a point of concern or a philosophy, and then it is up to the readers to discern it. Is this the kind of exchange between writer, idea, and reader that needs to be gotten rid of in Snow’s conception of the future? Could a world be constructed where regard for history is ignored?